Vertebral expansion self-opening structure for spinal fracture

Abstract

The invention discloses a vertebral expansion self-opening structure for spinal fracture, and belongs to the technical field of medical instruments. Comprising a rod body, a sliding rod is slidably connected to the inner side of the rod body, the first end of the sliding rod penetrates through the rod body and extends out, a connecting plate is fixedly connected to the first end, a supporting net is fixedly connected between the connecting plate and the sliding rod, and a supporting mechanism and a jacking mechanism are arranged on the inner side of the supporting net; through cooperation of parts such as the sliding rod, the connecting plate is driven to move towards the near end of the rod body, extrusion acting force is formed on the supporting net, and during the period, the supporting net gradually hunches up, so that stable and uniform supporting force is provided for the compressed and deformed vertebral body in a multi-point supporting mode according to the shape change of the vertebral body, and meanwhile the supporting force is adjusted according to the displacement distance of the sliding rod. The supporting force is visually mastered, the operation difficulty is remarkably reduced, the fracture risk caused by extrusion can be avoided when the supporting net bears the pressure of the vertebral body, and the clinical practicability and safety of the device are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, more particularly to a self-expanding structure for spinal fracture vertebral body. BACKGROUND

[0002] Vertebral compression fracture is a common type of spinal fracture, characterized by loss of vertebral height and spinal instability. Symptoms include severe pain, limited mobility with spinal deformity, and severe compression of the nerve causing cauda equina injury. When the spinal vertebral compression fracture is severe, surgical intervention is required, and the compressed vertebral body needs to be reduced.

[0003] The existing kyphoplasty for spinal fracture generally adopts the balloon expansion method, which involves percutaneous puncture to place an inflatable soft balloon into the compressed vertebral body, inflate the balloon to expand the collapsed trabeculae, restore the vertebral height and form a cavity, and then inject bone cement for reinforcement. However, this self-expanding structure for spinal fracture vertebral body has the problems of complex operation, limited balloon expansion effect, and high risk of balloon rupture, which can lead to expansion failure. Therefore, we designed a self-expanding structure for spinal fracture vertebral body to solve the above problems. SUMMARY

[0004] In view of the problems of the prior art, such as the complex operation of the self-expanding structure for spinal fracture vertebral body, the limited balloon expansion effect, and the high risk of balloon rupture which can lead to expansion failure, the present application aims to provide a self-expanding structure for spinal fracture vertebral body.

[0005] To solve the above problems, the present application adopts the following technical solution.

[0006] A self-expanding structure for spinal fracture vertebral body, comprising an outer shell, a rod body connected to the inner side of the outer shell, a sliding rod connected to the inner side of the rod body, and a first end of the sliding rod extending through the rod body, a connecting plate fixedly connected to the first end, a support net fixedly connected between the connecting plate and the sliding rod, and a support mechanism and a jacking mechanism provided on the inner side of the support net.

[0007] Optionally, the support mechanism further comprises four groups of L-shaped strips fixedly connected to one end of the rod body and one end of the connecting plate, each group of L-shaped strips has two L-shaped strips, and the top of each L-shaped strip is fixedly connected to one first connecting seat, and the bottom of the first connecting seat is provided with a connecting assembly.

[0008] Optionally, the connecting assembly comprises a plurality of groups of second connecting seats arranged on the outer wall of the sliding rod, each group of the second connecting seats is provided with four second connecting seats, and one arc plate is fixedly connected between every two of the second connecting seats, one limiting plate is fixedly connected to one side of each of the two second connecting seats, two first limiting grooves are arranged on the outer wall of the sliding rod, and a plurality of first limiting blocks are slidably connected to the inner side of each of the first limiting grooves, and each of the first limiting blocks is fixedly connected to one of the second connecting seats.

[0009] Optionally, the connecting assembly further comprises a first telescopic plate slidably connected to the inner side of the second connecting seat, a second telescopic plate slidably connected to the inner side of the first telescopic plate, a third telescopic plate slidably connected to the inner side of the second telescopic plate, a fourth telescopic plate slidably connected to the inner side of the third telescopic plate, and a fifth telescopic plate slidably connected to the inner side of the fourth telescopic plate, and the fifth telescopic plate is fixedly connected to the first connecting seat.

[0010] Optionally, the jacking mechanism comprises a first elastic block fixedly connected between the inner sides of the second telescopic plate and the first telescopic plate, a second elastic block fixedly connected between the inner side of the second telescopic plate and the third telescopic plate, a third elastic block fixedly connected between the inner side of the third telescopic plate and the fourth telescopic plate, and a fourth elastic block fixedly connected between the inner side of the fourth telescopic plate and the fifth telescopic plate.

[0011] Optionally, the elastic coefficients of the fourth elastic block, the third elastic block, the second elastic block and the first elastic block increase in turn.

[0012] Optionally, the jacking mechanism further comprises a compression spring installed between the inner side of the second connecting seat and the first telescopic plate, a rectangular plate fixedly connected to one side of the first telescopic plate, a rectangular strip fixedly connected to the bottom of the rectangular plate, a rotating wheel rotatably connected to the inner side of the rectangular strip, and a power assembly arranged at the bottom of the rotating wheel.

[0013] Optionally, the power assembly comprises rotating rings arranged on the outer wall of the sliding rod, and a plurality of rotating rings are arranged, four inclined surfaces are formed in the outer wall of each of the rotating rings, and the rotating wheel abuts against the inclined surfaces.

[0014] Optionally, the power assembly further comprises a rotating rod arranged on the inner side of the rod body, two second limiting grooves are formed in the outer wall of the rotating rod, a plurality of groups of second limiting blocks are slidably connected to the inner sides of the two second limiting grooves, each group of the second limiting blocks is provided with two second limiting blocks, two circular grooves are formed in the inner side of each of the rotating rings, one end of each of the second limiting blocks is rotatably connected to the inner side of one of the circular grooves, and an arc spring is installed between one side of the second limiting block and the circular groove.

[0015] Optionally, the inner side of the sliding rod is provided with a threaded groove, the rotating rod is threadedly connected to the inner side of the threaded groove, and one end of the rotating rod is fixedly connected with a circular plate.

[0016] Compared with the prior art, the technical scheme provided by the present application has at least the following beneficial effects:

[0017] In the above scheme, the cooperation of the sliding rod and other parts drives the connecting plate to displace towards the proximal end of the rod body, forming an extrusion force on the support net. During this process, the support net gradually arches, thereby adapting to the shape change of the vertebral body, and providing stable and uniform support force to the compressed vertebral body in a multi-point support manner. At the same time, the displacement distance of the sliding rod intuitively grasps the support degree, significantly reduces the operation difficulty, greatly improves the convenience and controllability of the surgical operation, and at the same time, the support net can avoid the risk of deformation or rupture caused by extrusion when bearing the pressure of the vertebral body, thereby effectively enhancing the clinical practicality and safety of the device.

[0018] By setting the supporting mechanism, the plurality of second, third, fourth and fifth extension plates are driven to move upwards, and at this time, under the action of the L-shaped strip, the plurality of second connecting seats are driven to move towards the direction of the rod body, so that the plurality of rotating plates, second, third, fourth and fifth extension plates form a multi-arched shape to support the support net, so that the plurality of rotating plates can disperse the single concentrated load into multiple node support forces, avoiding the stress concentration problem of the traditional single supporting mechanism, and at the same time, the support net and the multi-arched structure form a three-dimensional frame support, further improving the stability of the device.

[0019] By setting the cooperation of the third elastic block and other parts, the support net is tightened, thereby improving the support degree of the support net, and at the same time, improving the contact area between the support net and the compressed vertebral body, avoiding the point contact defect of the traditional rigid support, forming a multi-point occlusion fixation, and further improving the stability of the device.

[0020] By setting the jacking mechanism, the first extension plate is driven to move towards the first connecting seat, thereby driving the plurality of first connecting seats to move outward to extend, so that the support net can be expanded in the radial direction, thereby increasing the contact area between the support net and the compressed vertebral body, thereby improving the support effect on the compressed vertebral body, and at the same time, the flattened support net uniformly conducts the vertebral load through the first connecting seat, avoiding the stress concentration caused by the local protrusion of the traditional arched structure, thereby improving the stability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to make and use the application.

[0022] Figure 1 Schematic diagram of the mechanism of the present application;

[0023] Figure 2 Schematic diagram of the housing structure of the present application;

[0024] Figure 3 Schematic diagram of the support net structure of the present application;

[0025] Figure 4 Cross-sectional view of the present application;

[0026] Figure 5 Exploded view of the sliding rod and rotating rod of the present application;

[0027] Figure 6 Cross-sectional view of the support mechanism of the present application;

[0028] Figure 7 Schematic diagram of the partial structure of the support mechanism of the present application;

[0029] Figure 8 Exploded view of the sliding rod, rotating rod and rotating ring parts of the present application;

[0030] Figure 9 Schematic diagram of the first telescopic plate structure of the present application;

[0031] Figure 10 Cross-sectional view of the jacking mechanism of the present application;

[0032] Figure 11 Schematic diagram of the rotating ring structure of the present application;

[0033] Figure 12 Schematic diagram of the second limiting block structure of the present application.

[0034] [Reference Signs]

[0035] 1, shell; 2, sliding rod; 3, support net; 4, connecting plate; 5, L-shaped strip; 6, first connecting seat; 7, connecting column; 8, rotating plate; 9, rotating rod; 10, round plate; 11, first limiting groove; 12, first limiting block; 13, second connecting seat; 14, arc plate; 15, second limiting groove; 16, second limiting block; 17, rotating ring; 18, inclined surface; 19, limiting plate; 20, rectangular plate; 21, rectangular strip; 22, rotating wheel; 23, first telescopic plate; 24, first elastic block; 25, second telescopic plate; 26, second elastic block; 27, third telescopic plate; 28, third elastic block; 29, fourth telescopic plate; 30, fourth elastic block; 31, fifth telescopic plate; 32, compression spring; 33, rod body; 34, circular groove; 35, arc spring.

[0036] As shown in the drawings, in order to clearly realize the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the present application to the specific structures, devices and environments, and those skilled in the art can adjust or modify these devices and environments according to specific needs. DETAILED DESCRIPTION

[0037] The present application will be described in detail below with reference to the drawings and specific embodiments. It should be noted here that in order to make the embodiments more detailed, the following embodiments are the best, preferred embodiments, and other alternative ways can also be used by those skilled in the art to implement them; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0038] It should be noted that in the specification, "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like indicate that the described embodiments can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, when a specific feature, structure or property is described in combination with an embodiment, it should be within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments (whether or not explicitly described).

[0039] Generally, the terms can be understood at least in part from the context of their use. For example, depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular or can be used to describe combinations of features, structures, or characteristics, in the plural, without necessarily dictating whether any such feature, structure, or characteristic is required, only one, or plurally, Furthermore, the term "based on" can be understood as not necessarily of exclusive factors, but can instead allow for existence of additional factors not explicitly described, at least in part, depending on the context.

[0040] It is to be understood that the terms "on", "over", and "above" in the present application should be interpreted in the broadest possible way, such that "on" not only means "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "over" or "above" not only means "over" or "above" but also can include the meaning of "over" or "above" with no intervening features or layers therebetween.

[0041] In addition, spatially relative terms, such as "under", "below", "lower", "over", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein can similarly be interpreted accordingly.

[0042] As shown in Figures 1 to 12 The present application provides a kind of spinal fracture vertebral body expansion self-propelled structure, including shell 1, the inner side of the shell 1 is slidably connected with stem 33, the inner side of stem 33 is slidably connected with sliding rod 2, and the first end of sliding rod 2 is stretched out and passes through the stem 33, and the first end is fixedly connected with connecting plate 4, connecting plate 4 and sliding rod 2 are fixedly connected with support net 3 between sliding rod 2, and the inner side of support net 3 is provided with support mechanism and jacking mechanism;Support mechanism includes four groups of first connecting seat 6 fixedly connected in the inner side of support net 3, each group of first connecting seat 6 is provided with multiple, the inner side of each first connecting seat 6 is fixedly connected with connecting column 7, and one rotating plate 8 is rotatably connected between every two connecting columns 7 of each group;

[0043] The outer wall of sliding rod 2 and the end of stem 33, the outer wall of stem 33 and the end of shell 1 are all provided with buckle locking structure, and sliding rod 2 and stem 33, shell 1 and stem 33 can be fixed respectively.For example, the outer wall of the stem 33 and the proximal end inner wall of the shell 1, the outer wall of the sliding rod 2 and the proximal end inner wall of the stem 33 are respectively provided with mutually matched ratchet or thread locking structure (not shown in the figure), for fixing relative position after adjusting in place.

[0044] When performing spinal compression fracture surgery on a patient, the doctor first implants shell 1 into the compressed vertebral body through percutaneous puncture, then uses a specially designed clamping device to firmly grip stem 33, under continuous image monitoring, extends stem 33 to the appropriate position to control the extension distance of support net 3, and fixes shell 1 and stem 33 using buckle locking structure, so that support net 3 can extend different lengths according to patient needs, thereby improving the adaptability of the device.

[0045] When the shell 1 and the rod body 33 are fixed, the doctor releases the special clamping device from the fixation of the rod body 33, and firmly holds the sliding rod 2, then gradually pulls out the sliding rod 2 at a uniform force, which drives the connecting plate 4 to displace towards the proximal end of the rod body 33, and exerts a pressing force on the support net 3. In this process, the support net 3 gradually arches, so as to adapt to the shape change of the vertebral body, and provides stable and uniform support for the compressed and deformed vertebral body in a multi-point support manner. In order to ensure the safety and accuracy of the reduction process, the doctor will use the intraoperative fluoroscopy device to observe the reduction state of the vertebral body in real time after each distance of pulling operation is completed. When the image shows that the compressed vertebral body has recovered to the state before the fracture under the action of the support net 3, the doctor immediately stops the pulling operation of the sliding rod 2, and quickly uses the toggle buckle to lock and fix the rod body 33 and the sliding rod 2, so as to maintain the current support angle of the support net 3 and continuously provide stable support for the vertebral body. Therefore, the doctor can intuitively grasp the support degree according to the displacement distance of the sliding rod 2, which significantly reduces the operation difficulty and greatly improves the convenience and controllability of the operation. At the same time, the support net 3 can avoid the risk of deformation or rupture caused by extrusion when bearing the pressure of the vertebral body, which effectively enhances the clinical practicability and safety of the device, and provides a more reliable minimally invasive treatment scheme for patients with spinal fracture.

[0046] As shown in Figures 2 to 10 The support mechanism further includes four groups of L-shaped strips 5 fixedly connected to one end of the rod body 33 and one end of the connecting plate 4. Each group of L-shaped strips 5 is provided with two L-shaped strips 5, and the top of each L-shaped strip 5 is fixedly connected with a first connecting seat 6. The bottom of the first connecting seat 6 is provided with a connecting assembly. The connecting assembly includes a plurality of second connecting seats 13 arranged on the outer wall of the sliding rod 2. Each group of second connecting seats 13 is provided with four second connecting seats 13, and one arc plate 14 is fixedly connected between every two second connecting seats 13. One limiting plate 19 is fixedly connected to one side of each of the two second connecting seats 13. The outer wall of the sliding rod 2 is provided with two first limiting grooves 11. A plurality of first limiting blocks 12 are slidingly connected to the inner side of each of the two first limiting grooves 11, and the first limiting blocks 12 are fixedly connected with a second connecting seat 13. The connecting assembly further includes a first telescopic plate 23 slidingly connected to the inner side of the second connecting seat 13. The inner side of the first telescopic plate 23 is slidingly connected with a second telescopic plate 25. The inner side of the second telescopic plate 25 is slidingly connected with a third telescopic plate 27. The inner side of the third telescopic plate 27 is slidingly connected with a fourth telescopic plate 29. The inner side of the fourth telescopic plate 29 is slidingly connected with a fifth telescopic plate 31, and the fifth telescopic plate 31 is fixedly connected with the first connecting seat 6.

[0047] When the connecting plate 4 moves towards the rod body 33, the four L-shaped strips 5 are driven to move towards the rod body 33, thereby driving the plurality of rotating plates 8 to rotate under the action of the L-shaped strips 5, and driving the plurality of second telescopic plates 25, third telescopic plates 27, fourth telescopic plates 29 and fifth telescopic plates 31 to move upwards. At this time, the plurality of second connecting seats 13 are driven to move towards the rod body 33 under the action of the L-shaped strips 5, so that the plurality of rotating plates 8, second telescopic plates 25, third telescopic plates 27, fourth telescopic plates 29 and fifth telescopic plates 31 form a multi-joint arch shape to support the support net 3, so that the plurality of rotating plates 8 can disperse a single concentrated load into a plurality of node support forces, avoiding the stress concentration problem of a traditional single support mechanism, and the support net 3 and the multi-joint arch shape form a three-dimensional frame support, further improving the stability of the device.

[0048] As shown in Figures 3 to 12 The jacking mechanism includes a first elastic block 24 fixedly connected between the inner side of the second telescopic plate 25 and the first telescopic plate 23, a second elastic block 26 fixedly connected between the inner side of the second telescopic plate 25 and the third telescopic plate 27, a third elastic block 28 fixedly connected between the inner side of the third telescopic plate 27 and the fourth telescopic plate 29, and a fourth elastic block 30 fixedly connected between the inner side of the fourth telescopic plate 29 and the fifth telescopic plate 31. The elastic coefficients of the fourth elastic block 30, the third elastic block 28, the second elastic block 26 and the first elastic block 24 increase in order.

[0049] Before the connecting plate 4 moves towards the rod body 33, the second telescopic plate 25, the third telescopic plate 27, the fourth telescopic plate 29 and the fifth telescopic plate 31 have a tendency to move upwards under the action of the first elastic block 24, the second elastic block 26, the third elastic block 28 and the fourth elastic block 30. When the connecting plate 4 moves towards the rod body 33, the resistance to the upward movement of the second telescopic plate 25, the third telescopic plate 27, the fourth telescopic plate 29 and the fifth telescopic plate 31 is reduced under the action of the first elastic block 24, the second elastic block 26, the third elastic block 28 and the fourth elastic block 30. When the connecting plate 4 stops moving, the support net 3 is tightened under the action of the first elastic block 24, the second elastic block 26, the third elastic block 28 and the fourth elastic block 30, thereby improving the support degree of the support net 3, increasing the contact area between the support net 3 and the compressed vertebral body, avoiding the point contact defect of the traditional rigid support, forming a multi-point occlusion fixation, and further improving the stability of the device.

[0050] As shown in Figures 5 to 12As shown, the jacking mechanism further comprises a compression spring 32 mounted between the inner side of the second connecting seat 13 and the first telescopic plate 23, one side of the first telescopic plate 23 is fixedly connected with a rectangular plate 20, the bottom of the rectangular plate 20 is fixedly connected with a rectangular strip 21, the inner side of the rectangular strip 21 is rotatably connected with a rotating wheel 22, and the bottom of the rotating wheel 22 is provided with a power assembly; the power assembly comprises rotating rings 17 arranged on the outer wall of the sliding rod 2, and a plurality of rotating rings 17 are arranged, four inclined surfaces 18 are formed in the outer wall of each rotating ring 17, and the rotating wheel 22 abuts against the inclined surfaces 18; the power assembly further comprises a rotating rod 9 arranged in the inner side of the rod body 33, two second limiting grooves 15 are formed in the outer wall of the rotating rod 9, a plurality of groups of second limiting blocks 16 are slidably connected to the inner sides of the two second limiting grooves 15, each group of second limiting blocks 16 is provided with two second limiting blocks 16, two circular grooves 34 are formed in the inner side of each rotating ring 17, one end of each second limiting block 16 is rotatably connected with the inner side of one circular groove 34, and an arc-shaped spring 35 is arranged between one side of the second limiting block 16 and the circular groove 34; the inner side of the sliding rod 2 is provided with a threaded groove, the rotating rod 9 is threadedly connected to the inner side of the threaded groove, and one end of the rotating rod 9 is fixedly connected with a circular plate 10.

[0051] When the connecting plate 4 stops moving, at this time the support net 3 is supported to the specified position, at this time the doctor can clamp the circular plate 10 by using the clamping mechanism, twist the circular plate 10 clockwise, drive the rotating rod 9 to rotate, drive a plurality of rotating rings 17 to rotate, drive a plurality of rotating wheels 22 to move to the direction of the rectangular plate 20 under the action of a plurality of inclined surfaces 18, drive the rectangular plate 20 to move to the direction of the first connecting seat 6, drive the first telescopic plate 23 to move to the direction of the first connecting seat 6, drive a plurality of first connecting seats 6 to extend outward, so that the support net 3 can be radially expanded, thereby increasing the contact area between the support net 3 and the compressed vertebral body, thereby improving the support effect on the compressed vertebral body, and the flattened support net 3 uniformly conducts the vertebral load through the first connecting seat 6, avoids stress concentration caused by local protrusions of the traditional arch-shaped structure, and thereby improves the stability of the device.

[0052] The present application encompasses any substitutions, modifications, equivalent methods and solutions made on the essence and scope of the present application. In order for the public to have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be completely understood without the description of these details for those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0053] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A self-expanding vertebral body expansion structure for spinal fractures, characterized in that, include: The outer shell has a rod slidably connected to its inner side, and a sliding rod slidably connected to its inner side. The first end of the sliding rod extends through the rod and is fixedly connected to the first end. A support net is fixedly connected between the connecting plate and the sliding rod. A support mechanism and a lifting mechanism are provided on the inner side of the support net. The support mechanism includes four sets of first connecting seats fixedly connected to the inner side of the support net. Each set of first connecting seats has multiple first connecting seats. Each first connecting seat has a connecting column fixedly connected to its inner side. A rotating plate is rotatably connected between each pair of connecting columns in each set.

2. The self-expanding vertebral body expansion structure for spinal fractures according to claim 1, characterized in that: The support mechanism also includes four sets of L-shaped bars fixedly connected to one end of the rod and one end of the connecting plate. Each set of L-shaped bars has two bars, and the top of each L-shaped bar is fixedly connected to a first connecting seat. The bottom of the first connecting seat is provided with a connecting component.

3. The self-expanding vertebral body expansion structure for spinal fractures according to claim 2, characterized in that: The connecting assembly includes multiple sets of second connecting seats disposed on the outer wall of the sliding rod. Each set of second connecting seats has four seats, and an arc plate is fixedly connected between every two second connecting seats. A limiting plate is fixedly connected to one side of each of the two second connecting seats. Two first limiting grooves are provided on the outer wall of the sliding rod. Multiple first limiting blocks are slidably connected to the inner sides of the two first limiting grooves, and each first limiting block is fixedly connected to one of the second connecting seats.

4. The self-expanding vertebral body expansion structure for spinal fractures according to claim 3, characterized in that: The connecting assembly further includes a first telescopic plate slidably connected to the inner side of the second connecting seat, a second telescopic plate slidably connected to the inner side of the first telescopic plate, a third telescopic plate slidably connected to the inner side of the second telescopic plate, a fourth telescopic plate slidably connected to the inner side of the third telescopic plate, and a fifth telescopic plate slidably connected to the inner side of the fourth telescopic plate, and the fifth telescopic plate is fixedly connected to the first connecting seat.

5. The self-expanding vertebral body expansion structure for spinal fractures according to claim 4, characterized in that: The lifting mechanism includes a first elastic block fixedly connected between the inner sides of the second telescopic plate and the first telescopic plate, a second elastic block fixedly connected between the inner side of the second telescopic plate and the third telescopic plate, a third elastic block fixedly connected between the inner side of the third telescopic plate and the fourth telescopic plate, and a fourth elastic block fixedly connected between the inner side of the fourth telescopic plate and the fifth telescopic plate.

6. The self-expanding vertebral body expansion structure for spinal fractures according to claim 5, characterized in that: The elastic coefficients of the fourth elastic block, the third elastic block, the second elastic block, and the first elastic block increase sequentially.

7. The self-expanding vertebral body expansion structure for spinal fractures according to claim 6, characterized in that: The lifting mechanism also includes a compression spring installed between the inner side of the second connecting seat and the first telescopic plate. A rectangular plate is fixedly connected to one side of the first telescopic plate, and a rectangular bar is fixedly connected to the bottom of the rectangular plate. A rotating wheel is rotatably connected to the inner side of the rectangular bar, and a power component is provided at the bottom of the rotating wheel.

8. The self-expanding vertebral body expansion structure for spinal fractures according to claim 7, characterized in that: The power assembly includes a rotating ring disposed on the outer wall of the sliding rod, and multiple rotating rings are provided. Each rotating ring has four inclined surfaces on its outer wall, and the rotating wheel abuts against the inclined surfaces.

9. The self-expanding vertebral body expansion structure for spinal fractures according to claim 8, characterized in that: The power assembly also includes a rotating rod disposed inside the rod body. The outer wall of the rotating rod has two second limiting grooves. Multiple sets of second limiting blocks are slidably connected to the inner sides of the two second limiting grooves. Each set of second limiting blocks has two blocks. The inner side of each rotating ring has two circular grooves. One end of each second limiting block is rotatably connected to the inner side of one of the circular grooves. An arc-shaped spring is installed between one side of the second limiting block and the circular groove.

10. The self-expanding vertebral body expansion structure for spinal fractures according to claim 9, characterized in that: The sliding rod has a threaded groove on its inner side, and the rotating rod is threaded to the inner side of the threaded groove. One end of the rotating rod is fixedly connected to a circular plate.

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